He has a noticeably different look from the Joker we know and love from the Arkham games and as you might imagine, that's very intentional. In a Q&A on the official Discord for Suicide Squad: Kill the Justice League, Rocksteady was asked about the changes to the look of the iconic character. Advanced Scriptwriter Kate Watson spoke about what makes this Joker new and unique.
"Arkham Joker is iconic, from his look to Mark Hamills BAFTA award winning performance. We wanted our Joker to stand on is own one foot and be his own person. As you can see, the art teams have done an amazing job on his look. He feels put together, so although he has the Joker smudged make up, his feels intentional. His outfit is showy and over the top and this runs through to his traversal as well. As to performance, we have the amazing JP Karliak voicing Joker and honestly, his adlibs in session were often better than what we'd written, so he really helped us to develop this Joker."
Watson also explained why this Joker has a prosthetic leg, noting that it comes from his own anarchy. Amidst the Joker's antics, he blew his leg off with one of his own bombs: "Like all Jokers, our boy loves bombs and, as is the want of the Joker, he is not the most safety conscious when it comes to their detonation."
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